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Cephalopod hatchling growth: the effects of initial size and seasonal temperatures


Leporati, S and Pecl, GT and Semmens, JM, Cephalopod hatchling growth: the effects of initial size and seasonal temperatures, Marine Biology , 151, (4) pp. 1375- 1383. ISSN 0025-3162 (2007) [Refereed Article]

DOI: doi:10.1007/s00227-006-0575-y


Temperature is known to have a strong influence on cephalopod growth during the early exponential growth phase. Most captive growth studies have used constant temperature regimes and assumed that populations are composed of identically sized individuals at hatching, overlooking the effects of seasonal temperature variation and individual hatchling size heterogeneity. This study investigated the relative roles of initial hatchling size and simulated natural seasonal temperature regimes on the growth of 64 captive Octopus pallidus over a 4-month period. Initial weights were recorded, and daily food consumption and fortnightly growth monitored. Two temperature treatments were applied replicating local seasonal water temperatures: spring/summer (14-18°C) and summer/autumn (18-14°C). Overall octopuses in the spring/summer treatment grew at a rate of 1.42% bwd-1 (% body weight per day) compared to 1.72% bwd-1 in the summer/autumn treatment. Initial size influenced growth rate in the summer/autumn treatment with smaller octopuses (<0.25 g) growing faster at 1.82% bwd-1 compared to larger octopuses at 1.68% bwd-1. This was opposite to individuals in the spring/summer treatment where smaller octopuses grew slower at 1.29% bwd-1 compared to larger octopuses at 1.60% bwd-1. Initial size influenced subsequent growth, however, this was dependent on feeding rate and appears to be secondary to the effects of temperature. © 2006 Springer-Verlag.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Zoology
Research Field:Invertebrate biology
Objective Division:Environmental Management
Objective Group:Marine systems and management
Objective Field:Marine biodiversity
UTAS Author:Leporati, S (Mr Stephen Leporati)
UTAS Author:Pecl, GT (Professor Gretta Pecl)
UTAS Author:Semmens, JM (Professor Jayson Semmens)
ID Code:50200
Year Published:2007
Web of Science® Times Cited:48
Deposited By:TAFI - Marine Research Laboratory
Deposited On:2007-08-01
Last Modified:2009-09-21

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